Question

Match these items.

Answer 1

-- 'Ca' (Calcium) is an element.
-- The proton has a positive charge.
-- Nuclear fusion results in the synthesis of atoms of new elements.
-- H₂O (water) is a chemical compound. 
-- Nuclear fission is a decay of the nucleus.
-- The atomic number of an element is the number of protons 
      in each atom of it.
-- I suppose you're using the Greek letter  η  ('eta', not 'nu') 
      to represent the neutron.
-- I suppose you're using ' e ' to represent the electron.

Answer 2

Explanation:

1. Ca  → element

Ca is a symbol of calcium element categorize as alkali earth metal.

2. $H_2O$  → compound

Compound is a substance made up of two more than two different elements.

3. Nuclear decay  → fission

Fission is defined as process in which heavier unstable nucleus divide itself into two or more smaller stable nuclei with release of large amount of energy.

4. Nuclear synthesis  → fusion

Fusion is defined as process in which two or more nuclei combines together to form an larger nucleus with release of large amount energy.

5. η  → neutron

One of the subatomic particle of an atom located in the nucleus of an atom with no electrical charge.

6. Positive charge  → proton

One of the subatomic particle of an atom located in the nucleus of an atom with positive electrical charge.

7. e  → electron

One of the subatomic particle of an atom located inside an atom and outside the nucleus of an atom with negative electrical charge.

8. Number of protons in nucleus → atomic number

Atomic number of an atom is equal to the total number of protons present in the nucleus if the an atom.